From owner-freebsd-acpi@FreeBSD.ORG  Tue May 29 10:57:18 2012
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Date: Tue, 29 May 2012 12:57:16 +0200
From: Lars Engels <lars.engels@0x20.net>
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Subject: Re: How can I help with thinkpad x220 issues?
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Am 29.05.2012 11:38, schrieb Natacha Porté:
> Hello,
>
> on Wednesday 23 May 2012 at 10:05, Любомир Григоров wrote:
>> Well, brightness works with the command line, sooo.... I think it 
>> has to be
>> mapped to the hardware keys. There is a long thread where I 
>> discussed this
>> with a couple other members (toward the bottom for the recent 
>> brightness
>> discussion).
>> http://comments.gmane.org/gmane.os.freebsd.current/135827
>
> Thanks a lot for pointing this discussion, I found there information
> more up-to-date than what I previously found.
>
> In particular, according to what I understand from
> http://marc.info/?l=freebsd-current&m=133341372825281&w=2
> helping with the brightness seems to require a quite broad 
> understanding
> of ACPI and/or EC, and maybe also a good overview of how things work
> currently in FreeBSD. Both of these seem to be far beyond anything 
> that
> I can reach in a reasonable amount of time :-(

Oh, what I forgot:
Have you tried x11/xbacklight? You should be able to in- and decrease 
the
screen's brightness with it.